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The prime factorization of 71421 is 3 x 7 x 19 x 179 but that's probably not what we're dealing with here.

7

2 x 7 = 14

3 x 7 = 21

The LCM and GCF refer to the set as a whole, not the individual numbers.

The GCF of 7, 14, 21 is 7

The LCM of 7, 14, 21 is 42

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